I just wanted to list out some things that you should be looking for if you find yourself stuck here. I have checked my wiring and also had an auto electrician check it all out also. Granted, car was not on but still seemed like a lot of fuel to be returning. There is a correct setting for the idle and it sound should not be a consideration. It is going on a 1966 coronet with 1964 413 wedge. I look forward to your opinion on this matter. First, there is the obvious--the system has to learn. "Wouldn't the prime shot be half (2.5x) at 60 degrees and not 40 degrees? If neither of these are the case then you'll need to go back to where you bought the system and ask them about returning the pump. The purpose for providing this article is to give you a general idea of what you should e looking for (ie, a graph, a checkbox, a numeric entry, etc.) I'm worried that the engine will stall at idle. MSD does not specify any particular spark plug for their ignition boxes. Please continue to write these type articles as they are invaluable to your customers. Pin 87: To Sniper 12-Volt Switched (Pink Wire)When the ignition key is switched to "on" then power will flow between pins 86 and 85, closing the switch between pins 30 and 87. (Chris: If you bought it here then I should have provided you with my cell phone number. Ran well on carb and electronic ignition. You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. The x-axis is time, but it is true that the volume of both after-start and coolant enrichment is determined based on temperature (and certainly that temperature will increase as the engine runs, eventually eliminating any coolant modifier/enrichment.) The Ordering process was so easy and non-painful. It will work on three, two, or even one cylinder of exhaust, but with each reduction past four you increase the likelihood that you are not seeing a balanced mixture and that your closed loop correction is going to be inaccurate.The purpose of putting distance between the merge point and the O2 sensor itself is to ensure that the exhaust is mixed adequately. Don't let that get the best of you. 2-Barrel Sniper EFI 2300 Sniper EFI C10. Then draw the power for the relay directly from the battery. Why? :-D. Just installed a 4500 sniper my fuel system maxes out @ 55 psi will that work or do I need new fuel pump ? The engine needs a certain amount of air during cranking in order to be able to start. If it dies or drops more than 50-75 RPM the throttle is closed too far. Regardless, this screw will eventually need to be adjusted. Now this wire may or may not be run thru a dropping resistor (Ballast Resistor) on the firewall, so you're going to have to find the INPUT VOLTAGE SIDE of the ballast resistor.Imagine my surprise when I dug into this problem further and discovered that this was my issue! Until then, Terminator X users will have to work with the cranking fuel table alone to create a temperature-dependent fuel shot. FE 390 that currently has a Pertronix distributor with the Ignitor 2 module. Is a tremendous volume of fuel sprayed in all barrels? Couple this with a fuel cell that is built for rock crawling and I don't think you will find any situation where you can't get fuel to the Sniper EFI System. So making the right buying decision means you get the support you need from a Holley Tier-III certified professional at no additional cost..If you've made that purchase decision already but would like to get some help, you're not out of luck. You need a new fuel pump. It is likely that the main power and ground leads are not long enough. Read the instructions and Follow them. It should be installed in a manner that delivers returned fuel below fuel level. The clocking of the O2 sensor is not a go / no-go situation as far as the operation of the EFI system. Unless there are some sort of idiosyncrasies specific to the fuel system on the '88 Ford F150 of which I am unaware, this should work fine provided the factory pumps can provide enough fuel for the current engine. But you don't mention fuel pressure at the inlet. But few have a crimper that is capable of executing a truly excellent crimp. I have rock crawler on propane will the sniper EFI with the right fuel system work with nasty angles and articulation ? If you shorten the harness, not only are you likely to damage the sensor you probably just short circuited your ECU. Can you post a photo of the wiring on the ignition switch? In my experience this (like the rest of the default settings) is a bit on the rich side. Enable a 1D table3. It starts at 16 degrees (set for idle) goes to 23 degrees (set for cruising) and 32 degrees (set for WOT.) How Sniper EFI Helped Get The Andersons' C10 Project Back On Track. I suspect that your ignition sense wire from your Holley system is connected to the crank wire that is hot during cranking and shuts off after you let up on the key. #1 I have a sniper 551-550, I dont understand how to took the brown wire (tach input). Not some generic pump as some have speculated. Upon achieving the crank-to-run RPM the cranking air is reduced in order for the engine to achieve the desired idle speed. I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. One thing didn't make sense to me. First, remember that after-Start enrichment is not a fixed value. But weve also introduced some leanness from 4-10 seconds. Stay up to date with the latest releases, events, promotions and more. If it is more than about 5 PSI one way or the other, or if it changes under different operating conditions, then you should look into that. Is the fuel pressure correct? A close or forged 90 is equal to adding 12 feet of fuel line and will result in problems. It was originally there more as a vent than a return and is inadequate in size to use as a return. I see recommended plugs are resistor type. So now youre left with tuning the Fuel Prime Multiplier. Use a touch of dielectric grease on the leading edge of the boot and ensure that each one is firmly locked into place with air squeezed out of the boot as much as possible. I strongly recommend EFI System Pro. I think my tach is on there. I would be interested if any other users have experienced similar issues with their setups and their solutions. Had issues so Im now going with the Holley in tank pump. Starts & immediately dies. Engines require three things to run. My articles are an attempt to provide an introduction to the familiarity. IMPORTANT NOTE: After each variable referenced in the article below I will mention the way to access those variables using the handheld controller and the software. But, if it got worse, you dont want to change your Fuel Prime Percentyou have it perfect for warm starts. There must be an option that has been found to work. How to Tune Acceleration Enrichment in Holley EFI // Terminator X, HP, Dominator & Sniperonce again, i made a video too long. sniper Installation If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! I always recommend fixing one thing at a time. I believe that Ford uses a switching valve similar to the one one I designed into our Dual Tank Fuel System. Exactly. Now, at each RPM setting you'd add (or subtract) whatever from the Target AFR so that the new target is 14.0:1. We offer two potential solutions. (Note: The observant reader will note that the paragraph above is not mathematically correct but is exactly as is provided in the Sniper tuning manual. Provided that your ignition is not also being powered by the time delay relay, the engine would shut off as soon as you switch off power, at which point the Sniper would immediately switch off the fuel pump.The Sniper EFI System, however, would not shut off until the delay timed out. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. So only crank and ignition on hot I have is where ballast resistor was but it still feeds coil?Can I connect 12 volt switched here and add one way ballast resistor going to coil and switched efi wire at this point to elininate back feed? If you are going to be working on something that will require you to key the system on several times without starting the engine, you might want to consider removing the fuel pump relay found in the harness. So, yea it gonna ALWAYS be hard to start!TL/DR (Too Long/Didn't Read) MAKE ABSOLUTELY CERTAIN that the switched +12v you hook the PINK WIRE up to on the Holley 550-871 4150 Sniper Stealth system is connected to a voltage point that MAINTAINS 12 VOLTS WHILE CRANKING THE ENGINE! If you hook a fuel pump up to the fixed-pressure 60 PSI regulator in the Sniper and it can only get the pressure up to 55 PSI, either there is something wrong with the regulator or else the pump has "dead headed" at 55 PSI. I have it disconnected to flush any debris out.Thank you. Enjoy! The challenge will be what you call the "right fuel system". I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. I have been looking at all efi units and I keep coming back to the Sniper. Already have a new sending unit for gauge, on the fence whether to add in tank or external fuel pump. You have that where you want it. EFI sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives great. Most important!!! Super helpful. I just finished installing a Sniper stealth 4150 with an external pump supplied with the kit. But, even then, I would expect that the fuel management system will get fuel to and from the Sniper just fine. You can adjust your after-start enrichment values in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > After-Start Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Decay Rate tab (Also called After Start Enrichment Time), Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Holdoff tab, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Enrichment tab. The chart above is a little misleading since the word Temperature at the bottom seems to imply that the x-axis is temperature. If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. Your engine will be dependent on cranking fuel entirely. Why? To be 100% honest I was having an issue prior and flooded it. Bolt-On EFI for your There is really no room for error on this. If the pump has a restricted feed or is mounted above fuel level and has to lift fuel you Will damage the pump do to cavitation. Thanks in advance. Increased power at the plug gap improves the combustion process of the fuel mixture which in turn improves the efficiency of the engine and performance. Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. Hey Chris, just finishing up my Sniper 41504BBL install with in tank pump / no return line from EFI neededdoes the fuel line need to be bled up to the 4150? HP ECU's. :-) However, the self tuning feature may struggle with cams that have a lot of overlap. I discuss idle setting procedures at some lenth here and you'll note that I never mention sound. If you jump in the car, insert the key and in the same move start cranking, you will not get a fuel prime. However, each engine is different. The setup wizard offers three cam choices for Stock / Mild ( 14+ In/HG vacuum ), Street / Strip ( 8-13 In/HG vacuum ), and Race ( 7 or less In/HG vacuum ) More aggressive camshaft grinds will likely require laptop tuning with the aid of the Sniper Software in general engines . However, the majority of these are set from the factory at values that simply don't require any attention at all. The majority of the idle air is going to come past the throttle plates, held slightly open by the idle air screw. Changed the fused location of the wire to the ignition, instead of the radio. Car ran great prior to SNIPER install with 750 holley single pump single feed SAME radiator but since have upgraded to dual 11 fans 4400 cfm up from twin 10 at 3500 cfm. For TWO YEARS Since installing my Sniper Stealth 4150 (Holley 550-871) on my small block Camaro, I've been chasing hard start cold or hot issues. 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